期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 382, 期 -, 页码 318-327出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2015.01.080
关键词
Graphene; Graphene magnetism; Graphene nanoflakes; Metamagnetic transition; Hubbard model; Phase diagram
资金
- Polish Ministry of Science and Higher Education
The paper discusses the influence of the external in-plane electric and magnetic fields on the ground state spin phase diagram of selected monolayer graphene nanostructures. The calculations are performed for triangular graphene nand-lakes with armchair edges as well as for short pieces of armchair graphene nanoribbons with zigzag terminations. The mean field approximation (MFA) is employed to solve the Hubbard model. The total spin for both classes of nanostructures is discussed as a function of external fields for various structure sizes, for charge neutrality conditions as well as for weak charge doping. The variety of nonzero spin states is found and their stability ranges are determined. For some structures, the presence of antiferromagnetic orderings is predicted within the zero-spin phase. The process of magnetization of nand-lakes with magnetic field at constant electric field is also investigated, showing opposite effect of electric field at low and at high magnetic fields. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据